After installing Internet Explorer 8 Beta 2 if you try to login to Outlook Web Access (OWA) you may encounter an application crash (due to urlmon.dll failing module). The resolution for this hopefully temporary problem (i.e. to be resolved before the final version), is to go to Internet Explorer settings / Advanced / HTTP 1.1 settings, and uncheck both “Use HTTP 1.1” checkboxes from there, followed by restarting the browser.